Electric-arc lamp.



'Patented May l, |900. H. .v JAMES.

ELEcTmc Anc LAMP.

(Application ledct; 10, 1899.)

TN: Nonms Prrzns co.. PHoTouTHo.. wAsmNGYoN. u. c.

(No Model.)

mea/MM UNrTEn STATES PATENT OFFICE@ IIENRIT VINCENT JAMES,

OE SALFORD, ENGLAND.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 648,625, dated May 1,1900.

Application filed October 10, 1 899. Serial No. 733,222. (No model.)

T0 all 'wwnt t muy concern:

Be it known that I, HENRY VINCENT J AMES, electrical engineer, a subjectof the Queen of Great Britain and Ireland, residing at Westhill, HigherBroughton, Salford, in the county of Lancaster, England, have inventedcertain new and useful Improvements in Electric- Arc-Lainp Clutch andFeed Mechanism, of which ,the following is a specification.

This invention relates to an improved clutch and feed mechanism forelectric-arc lamps of both the open and closed types and wherein thecarbons are placed in a vertical line one above another, the object ofthe invention being to enable an arc to be struck between the carbonsand to maintain such arc at a constant current during working and toinally bring the carbons together when no electricity is passing throughthe lamp.

The invention will be fully described with reference to the accompanyingdrawings, in which- Figure 1 is a front elevation of the improved clutchmechanism as applied to an electricarc lamp of the inclosedtype; 2, asectional elevation of same; Fig. 3, a side elevation; Fig. 4, a plan,and Fig. 5 a view showing a modification of clutch. Fig. 6 is a sideelevation of clutch arranged for an Aelectricarc lamp of the open type;Fig. '7, front view of same, and Fig. 8 a sectional elevation of same.

In all the drawings like parts are represented by the samereference-letters.

Referring principally to Figs. l to et, a is the upper carbon of thelamp, and l) is a tubular guide up which the carbon passes and whichacts as a steadying agent for the travel of the latter, the carbon beingelectrically connected with the tube b at its upper end by any usualform of thimble b', as indicated in Figs. 1 to 3. This tube is raised orlowered by the magnets of the controlling coil or coils of the lamp. Theclutch proper consists of a plate or ring c, coupled to the lower end oftube b, the attachment being accomplished by slitting the plate andforming on it two lugs d, which can be nipped together by the screw c,so as to securely iix the tube and plate together. On two sides theplate is provided with slots j", through which are passed the upper endsof two similarly-constructed levers g, the lower ends of which arepivotally connected by pins 71, to a second plate or ring t', throughthe center of which the carbon ct passes. The pins h are arranged nearerthe center of the carbon than the slots f, so that the levers g are atan acute angle to each other. At a suitable point between the two platesc and c' the levers g have each passed through them a screw j, arrangedto engage with the carbon (t to hold it in position, and at the upperends the levers have also passed through them screws or pins k to limitthe travel and prevent the levers becoming disengaged from the plate c,though after removing the carbon the levers can be readily disengaged bywithdrawing the screws when required.

The clutch, as described, operates as follows: The raising and loweringof the tube b is effected by the usual controlling coil or coils of thelamp, and this being so it will be seen that if the bottom plate t'rested upon the rigid frame of the lamp, which is represented bythedotted line l, any downward movement of the tube b would cause the slotsf in the plate c to push the upper ends of the levers g outward, thusdisengagin g the screws j from the carbon and allowing the latter tofall by gravity, so as to feed the lamp. On the other hand, an upwardmovement of the tube b and ring c would pull the levers g t0` gether,and the screws would move inward to grip the carbon. Any further upwardmotion of the tube b other than that necessary to grip the carbon causesthe whole clutch and carbon to be raised simultaneously to a heightcontrolled by the regulating-coils. It will thus be seen that the clutchis not only very simple in construction, but that it is very powerfuland so arranged that no vibration of the lamp when working will cause itto slacken its grip of the carbon.

In Fig. 5 the screws j are dispensed with, and the levers g have formedintegral with them or affixed thereon lugs or projections m, which bearagainst the carbon in the same manner as the screws, though, unlike thelatter, they are not adjustable. For the open type of lamp thearrangement shown in Figs. 6 to 8 is adopted. In this case the upper endof the carbon a is fixed to a holder consisting of a circular disk n,provided with a cen- IOO tral hollow boss o, to the lower end of whichthe carbon is attached, while to the upper end is screwed or otherwisesuitably attached a tube p. The levers g grip this tube instead ot thecarbon, and as the tube is smoother than the latter modified means areadopted to effect a tight grip. To this end the levers g are providedwith bosses q, preferably on their inner sides, which are drilled withholes tor the reception of india-rubber or like pads fr, the inner endsof which abut againstl and hold the tube 2). As the rubber pads wearthey are fed forward by screws s in the opposite ends of the holes. Inother respects the clutch in Figs. (5 to 8 similar to that firstdescribed and its action is exactly the same.

That l claim as my invention, and desire to protect by Letters Patent,is-

l. ln a clutch and feed mechanism for an electric-arclamp ol' theinclosed type the combination with a carbon (t and a tubular guide orholder h, raised and lowered by the magnets of the usual controllingcoil or coils of the lamp, oli a plate or ring c located at the lowerend of the tube h and provided with lugs l and screw c to couple it totube l) and with slotsf through which levers y are passed, le vers gpassing through slots j" and pivotally connected to a second plateorring fz located below plate or ring c and encircling the carbon (t,screws j passed through levers g and engaging with carbon a, and screws7c for limiting travel of levers g, substantially as dcscribed.

E2. In a clutch and leed mechanism for an electric-arc lamp of theinclosed type the combination with a carbon u and a tubular guide orholder l), raised and lowered by the magnets of the usual controllingcoil or coils of the lamp, of a plate or ring c located at the lower endof tube h and provided with lugs (l and screw e to couple it to tube ZJand with slots f through which levers g are passed, le-

` vers g passing through slots and pivotally connected to a second plateor ring t' located below plate or ring e and encircling the carbou a,and lugs or projections m formed integral with or attached to lovers gsubstantially as described.

3. In a clutch and Al'eed mechanism for an electric-are lamp ot' theopen type the co1nbi nation with a carbon a and a tubular guide orholder h, raised and lowered by the magnets of the usual coutrollingcoilor coils ot the lamp, of a plate or ring c located at the lower end oftube Z) and provided with lugs d and screw e to couple it to tube h andwith slotsf through which levers g are passed, levers r/ passing throughslots fand pivotally connected to a second plate or ring i., plate orring if lo cated below plate or ring c and encircling the carbon d,bosses (j t'ormcd integral with lovers g, rubber pads fr located insaid. bosses and engaging with tube jp, screws s for advancing pads o'toward tubes l) passing through rings c and yI, disk a with boss olocated at the end of tube p, and screws A/' [or limiting travel oflevers Q, substantially as described.

ln witness whereof l have hereunto sot my hand in the presence of twowitnesses.

HENK/.Y VlNCEU'l JAMES. lVitnesscs:

WILLIAM il. '1`A'YLo'n, JAs. S'rnwnu'l Rueilvoor.

